Reference for Zevachim 57:12

אחרים אומרים לא יחשב במחשבה הוא נפסל ואינו נפסל בשלישי

Because it is said, [When thou shalt vow a vow unto the Lord thy God,] thou shalt not delay to pay it:<span class="x" onmousemove="('comment',' Deut. XXIII, 22.');">¹²</span> You might think that also he who delays [the fulfilment of] his vow incurs [the sentence] 'it shall not be accepted' therefore it says, 'it': 'it' [piggul] is subject to 'it shall not be accepted', but he who delays his vow is no subject to 'it shall not be accepted'.

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